Patent US3863131A successfully refreshed from Google Patents.
US3863131A
Expired / Lapsed
US
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Chopper transistor driver and feedback circuit for regulated dc to dc power converters using separate input and output grounds
Assignee: United States Department of the Air Force
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Filing: 1973-09-06
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Granted: 1975-01-28
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Expires: 1993-09-06
Abstract
Abstract A transistorized chopper driver and feedback circuit apparatus having separate input and output grounds for providing a regulated D.C. to D.C. power converter apparatus. The chopper driver and feedback circuit utilizes a master square wave oscillator which has a transformer-coupled output to supply both polarities of the same output wave referenced to both grounds. A feedback circuit is utilized to drive the main chopper transistors with a feedback signal derived from the output voltage of the power converter.
Inventors
- 👤 Malcolm D Muir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:28
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3376; H02M3/3378
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
224 words
A chopper transistor driver and feedback circuit apparatus for regulated D.C. to D.C. power converters using separate input and output grounds comprising in combination: a master oscillator to provide a first and second output waveform, said first output waveform comprising a first and second square wave of oppposite polarity, said second output waveform having a third and fourth square wave of opposite polarity, said first and second square wave being referenced to input ground, said third and fourth square wave being referenced to output ground, chopper drivers receiving said first and second output waveforms, said chopper drivers providing a first and second chopper output signal in accordance with the polarity of the said received first and second output waveforms. a power chopper circuit receiving said first and second chopper output signal, said power chopper circuit receiving an input voltage signal, said power chopper circuit being referenced to input ground, said power chopper circuit providing a chopped output signal, said chopped output signal being referenced to output ground, said chopped signal being applied to a rectifier and filter circuit, said rectifier and filter circuit providing an output voltage signal, and a feedback control circuit receiving a portion of said output signal, said feedback control circuit applying a control signal to said chopper drivers, said control signal establishing the duty cycle of said power chopper circuit.
Claim 2
Dependent Claim
224 words
A chopper transistor driver and feedback circuit apparatus for regulated D.C. to D.C. power converters using separate input and output grounds comprising in combination: a master oscillator to provide a first and second output waveform, said first output waveform comprising a first and second square wave of oppposite polarity, said second output waveform having a third and fourth square wave of opposite polarity, said first and second square wave being referenced to input ground, said third and fourth square wave being referenced to output ground, chopper drivers receiving said first and second output waveforms, said chopper drivers providing a first and second chopper output signal in accordance with the polarity of the said received first and second output waveforms. a power chopper circuit receiving said first and second chopper output signal, said power chopper circuit receiving an input voltage signal, said power chopper circuit being referenced to input ground, said power chopper circuit providing a chopped output signal, said chopped output signal being referenced to output ground, said chopped signal being applied to a rectifier and filter circuit, said rectifier and filter circuit providing an output voltage signal, and a feedback control circuit receiving a portion of said output signal, said feedback control circuit applying a control signal to said chopper drivers, said control signal establishing the duty cycle of said power chopper circuit.
Claim 3
Dependent Claim
112 words
A chopper transistor driver and feedback circuit apparatus as described in claim 1 wherein said chopper driver comprises in combination: a pair of transistor switches arranged to respectively receive said first and second output waveforms, one of said pair of transistor switches being in the one state, the other one of said pair of transistor switches being in the off state at the same instant in time, said pair of transistor switches alternating their on/off states with respect to said received first and second output waveform, said pair of transistors both being in the off state during the time said feedback control signal establishes the duty cycle of said power chopper circuit.
Claim 4
Dependent Claim
98 words
A chopper transistor driver and feedback circuit apparatus as described in claim 1 wherein said feedback control circuit comprises in combination: a difference amplifier receiving a portion of said output signal, said difference amplifier comparing said output signal to a voltage reference source, said difference amplifier providing a difference voltage output signal, a monostable multivibrator receiving said difference voltage output signal, said monostable multivibrator being voltage variable, and, a differentiator circuit receiving said second differentiator circuit providing a triggering signal, said triggering signal triggering said monostable multivibrator, said monostable multivibrator providing a control signal to said chopper drivers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |